estimated 75% of products that consumers use include corn. back in new york city, you would think the heat would be good for iced cream sales. one vendor says it's driving away business. >> right now it is too hot. >> reporter: and people are still out tonight despite all of this heat. experts are reminding people to stay hydrated and that goes for making sure your pets get enough water too. lester? >> thank you. let's find out more about that storm threat and when relief is expected from the heat. kelly cast joins us now. >> reporter: millions of people sweating it out. we're talking about oppressive humidity. you can see the area shaded in the darker orange that is dangerous heat to be outdoors make sure you stay hydrated. but there is some relief in sight. we have a cold front sagging to the south. new york city will get a cool wind cooling us back to average we are talking the mid 80s. but still south of that front, very oppressive. severe weather a threat with that cool down. severe thunderstorm watches are in effect for the entire state